[rules-users] Problems building Package

Hello, I get the following Nullpointer exception when building the package: java.lang.NullPointerException at org.drools.rule.AbstractCompositeRestriction.getRequiredDeclarations(AbstractCompositeRestriction.java:29) at org.drools.rule.MultiRestrictionFieldConstraint.getRequiredDeclarations(MultiRestrictionFieldConstraint.java:27) at org.drools.rule.Pattern.setConstraintType(Pattern.java:279) at org.drools.rule.Pattern.addConstraint(Pattern.java:157) at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:340) at org.drools.rule.builder.PatternBuilder.buildConstraint(PatternBuilder.java:199) at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:168) at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:93) at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:69) at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:53) at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167) at com.dssrules.RuleEngineAdapter.initRuleBase(RuleEngineAdapter.java:71) at com.dssrules.TestRuleEngineAdapter.main(TestRuleEngineAdapter.java:17) Exception in thread "main" java.lang.NullPointerException at com.dssrules.RuleEngineAdapter.insert(RuleEngineAdapter.java:42) at com.dssrules.TestRuleEngineAdapter.main(TestRuleEngineAdapter.java:35) Debugging shows the programm get stuck in this line (the resource drl-file was found): * builder0.addPackageFromDrl(new InputStreamReader(resource.getInputStream())); I have further the error message: Missing package name for rule package." Although the package declaration in the drl-file should be ok, it worked in the previous drl version. I don't know why it doesn't work anymore. Regards Thomas *